为了应对全球对氟氯化碳和氟氯烃化合物的禁令/限制，氨是一种很好的制冷剂。换热器设计人员在强化管中冷凝氨的传热和流体流动数据非常有限，而使用混相油冷凝氨的数据也非常有限。这项研究将产生对工程师设计新技术制冷和空调设备有价值的数据，这些设备适用于各种氨应用市场（即制冷冷凝器、HVAC冷凝器盘管和成套冷却器、超市制冷系统等）。这项研究产生的数据的相关性将用于冷凝器建模还有设计。本研究项目的目标是:a）为典型的空调和制冷热交换器的热通量和质量通量范围内的氨管内冷凝生成基本的局部两相传热和流体流动数据。 b） 量化强化表面管对两相冷凝传热系数和压降的影响。c） 量化混相油对两相冷凝传热系数和压降的影响。d） 以一种对设计师有用且适合在ASHRAE基础知识手册中发布的形式，对数据进行关联。

Ammonia is a strong candidate for use as a refrigerant in response to the global bans/restrictions on CFC, and HCFC compounds. There is very limited heat transfer and fluid flow data available to heat exchanger designers for condensing ammonia in enhanced tubes, and no data available for condensing ammonia with miscible oil. This research will generate data that will be valuable to engineers designing new technology refrigeration and air-conditioning equipment for various markets open to the application of ammonia (i.e., Refrigeration Condensers, HVAC Condenser Coils and Packaged Chillers, Supermarket Refrigeration Systems, etc.) Correlation of the data generated by this research will be used in condenser modeling and design.The objectives of this research project are: a) To generate basic local two-phase heat transfer and fluid flow data for in-tube condensing of ammonia for heat and mass flux ranges typical of air-conditioning and refrigeration heat exchangers. b) To quantify the effects of enhanced surface tubing on two-phase condensing heat transfer coefficient, and pressure drop. c) To quantify the effects of miscible oils on two-phase condensing heat transfer coefficient and pressure drop. d) To develop correlation of the data in a form useful to designers and suitable for publication in the ASHRAE Fundamentals Handbook.